According to realestate.com.au, couples can afford to buy in every single suburb of outback South Australia without tipping into mortgage stress, where the median house price sits at $428,083. By contrast, Adelaide Central and Hills — the state's most unaffordable region — leaves buying couples locked out of 45 per cent of its suburbs. The gap between what South Australian households can borrow and what they can actually buy has widened sharply as the current rate cycle bites into borrowing capacity.
AFMS Group's Borrowing Capacity Snapshot
The research, conducted by AFMS Group, assessed five borrower profiles across ten lenders and benchmarked estimated borrowing capacities against median house prices in 87 regions nationally. In South Australia, the results split sharply by geography. The Barossa, Yorke and Mid North region — median price $596,164 — allowed couples to buy in 99 per cent of suburbs, while the South East region, with a median of $643,333, came in at 96 per cent. Adelaide's northern suburbs ranked fourth at 92 per cent and the city's broader suburban belt fifth at 71 per cent.
This regional spread matters because it confirms what lenders have been flagging for months: borrowing capacity has not fallen uniformly across the state. Rate rises compress the maximum loan amount a bank will approve, but the effect is magnified in markets where median prices sit closer to that borrowing ceiling. Outback and regional SA markets, with lower entry prices, have more headroom before affordability becomes a binding constraint. Adelaide's inner and hills markets, already priced at a premium, have almost no such buffer left.
For buyers currently shopping with a pre-approval in hand, the practical takeaway is blunt: a borrowing capacity calculated six or twelve months ago may no longer reflect what a lender will approve today. Couples targeting Adelaide Central and Hills should expect their serviceability to be tested harder than those looking regionally, and should budget for a wider gap between pre-approval figures and final loan offers.
Why the Gap Is Widening
Realestate.com.au senior economist Eleanor Creagh pointed to six consecutive months of price falls as of September, which she said was making home ownership more achievable for some buyers even as borrowing capacity shrinks. "Higher interest rates are weighing on borrowing capacity and buyer demand," Creagh said, noting that downward momentum has strengthened in Adelaide, Brisbane and Perth after those markets had previously shown more resilience than Sydney and Melbourne.
Creagh also flagged a disconnect in the spring selling season — usually property's busiest period — where auction clearance rates have remained soft, homes are taking longer to sell, and sales volumes sit below last year's levels. That combination points to a widening gap between what buyers are willing to pay and what sellers expect to receive, a dynamic that compounds the affordability squeeze documented in the AFMS data. Borrowers weighing up fixed vs variable mortgage options are making that decision against a backdrop where further price falls are considered likely, but Creagh noted resilient employment and limited forced selling should contain the severity of any adjustment.
Reduced buyer purchasing power remains the dominant pressure on prices, rather than large numbers of owners being forced to sell.
Loan Market's October trends report adds weight to this picture. SA loan lodgements have dropped 25 per cent since January, before the current rate rise cycle began, with investors recording the steepest fall at 39 per cent, followed by owner-occupier upgraders at 25 per cent — the highest upgrader decline of any state — and first home buyers down 10 per cent. Loan Market credit expert Shay Waraker said buyers were being more cautious as prices decline and rates climb, with many waiting to see whether further falls materialise before committing.
Background: Rates, Refinancing and the Borrowing Squeeze
Waraker noted that rate increases typically trigger two parallel trends: a drop in new loan lodgements and a rise in refinancing activity, as existing mortgage holders scrutinise their current deal for savings or flexibility. That pattern is playing out in SA, where households are reportedly looking for "wriggle room" in their budgets following the rate rises. Understanding how lenders actually calculate serviceability — and how fixed and variable structures interact with that calculation — is covered in detail in APF's guide to fixed vs variable rate mortgages in Australia, which remains relevant context for any borrower reassessing their position in this cycle.
Separate Westpac research cited in the same reporting found 38 per cent of South Australians are delaying plans to buy or sell because of interest rate concerns — the highest proportion of any state in the country. That figure underscores how psychological the affordability squeeze has become: it is not just borrowing capacity numbers on a spreadsheet, but a broader hesitancy rippling through household decision-making around major life purchases.
What This Means for SA Buyers and Investors
For first home buyers, the AFMS data offers a practical roadmap rather than a discouraging headline. Outback and regional corridors — Barossa, Yorke, Mid North and the South East — currently offer the largest margin between borrowing capacity and median prices, meaning buyers there face less risk of being knocked back on serviceability or stretched into stress. Those fixated on inner Adelaide suburbs should expect tighter approvals and may need to widen their search radius or reconsider loan structure to improve their position.
Investors face a starker picture. With SA investor loan lodgements down 39 per cent since January — the steepest fall of any borrower category — the economics of entering the market have shifted markedly, and those remaining active are facing materially reduced borrowing headroom compared to earlier in the cycle. This sits alongside separate national coverage tracked at REAStats, which has been monitoring foreign-buyer property investment activity and how listing turnover times vary between different parts of the country.
Owner-occupiers looking to upgrade should take particular note of the 25 per cent lodgement decline in that category — the highest of any state — as it signals growing caution even among buyers who already own property and have equity to leverage. Anyone assessing their own numbers this spring should treat a lender's indicative borrowing capacity as a starting point, not a guarantee, and stress-test their budget against the possibility that rates remain at current levels for longer than hoped.
The clearest signal from this research is that geography now matters more than ever for South Australian buyers. A couple with identical income and deposit could qualify to buy comfortably in outback SA while being shut out of 45 per cent of suburbs in Adelaide's Central and Hills region. Understanding exactly where that borrowing-capacity line falls — suburb by suburb — is now as important to the purchase decision as the loan rate itself.
This article was produced with AI assistance and reviewed for accuracy. Content is for informational purposes only and does not constitute financial or property investment advice.
